The Warhammer 40k Wiki defines a "Heretek" as a Tech-priest who defies the Cult Mechanicus to pursue forbidden technologies. In the context of the game, this expansion introduces:
The "CODEX" tag at the end indicates that this is a release from the digital piracy group known as CODEX , who were known for "cracking" game digital rights management (DRM) before they disbanded in early 2022. Warhammer.40000.Mechanicus.Heretek.v1.4.0-CODEX...
Additional customization for your Cohort, including new troop types like the Sicarian Infiltrator and Ruststalker. The Warhammer 40k Wiki defines a "Heretek" as
The "Xenarite," focusing on the use of forbidden xenos technology. Warhammer.40000.Mechanicus.Heretek.v1.4.0-CODEX...
A subplot set within the Caestus Metalican where players face off against rogue Tech-priests.